1. Department of Radiology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
2. Section of Neuropathology, Department of Pathology, Oslo University Hospital, Oslo, Norway
3. Institute of Clinical Medicine (KlinMED), Faculty of Medicine, University of Oslo, Oslo, Norway
4. Department of Oncology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
5. Department of Neurosurgery, Ullevål Hospital, Oslo University Hospital, Oslo, Norway
6. Department of Neurology, Ullevål Hospital, Oslo University Hospital, Oslo, Norway